Any advice for getting back into documentaries?

For the past five years, I was a Lighting Cameraman at a creative agency but I've now left to go freelance and would like to transition into documentaries, travelogues, that sort of programming. I've done events, some sports and branded content since leaving my full-time job, but I don't really know how to approach getting back into TV. The last five years without credits certainly don't help. I worked in TV before but that was in OB and Studio.